$ban = $('.banner-container')

var ref = 100;
var scroll, zoom;

$(window).scroll(function (event) {
    scroll = $(window).scrollTop()
  
    zoom = 100 + scroll/30
 
    $ban.css('background-size', zoom + '%');

	if($(document).scrollTop()>200) {
		$("h1").removeClass("off").addClass("movie");
	} else {
		$("h1").removeClass("movie").addClass("off");
	}
  
});